1 Samuel 24:13

By their fruits you will easily recognize them. Are grapes gathered from thorns or figs from brambles?

So by their fruits at any rate, you will easily recognize them.

"Either grant the tree to be wholesome and its fruit wholesome, or the tree poisonous and its fruit poisonous; for the tree is known by its fruit.

For out of the heart proceed wicked thoughts, murder, adultery, fornication, theft, perjury, impiety of speech.

Treasury of Scripture Knowledge

As saith the proverb of the ancients, Wickedness proceedeth from the wicked: but mine hand shall not be upon thee.

By their fruits you will easily recognize them. Are grapes gathered from thorns or figs from brambles?

"Either grant the tree to be wholesome and its fruit wholesome, or the tree poisonous and its fruit poisonous; for the tree is known by its fruit.

For out of the heart proceed wicked thoughts, murder, adultery, fornication, theft, perjury, impiety of speech.

But the things that come out of the mouth proceed from the heart, and it is these that defile the man.